Experimental study on pull-out capacity of screw connections for cold-formed thin-walled steel structures

被引：0

作者：

Deng L. ^{[1
,2
]}

Yang Y. ^{[1
]}

Liu D. ^{[3
]}

Huang Y. ^{[1
]}

机构：

[1] College of Civil Engineering, Hunan University, Changsha

[2] Key Laboratory for Damage Diagnosis for Engineering Structures of Hunan Province, Hunan University, Changsha

[3] DR. Home Technology Co., Ltd, Beijing

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷 / 12期

关键词：

Cold-formed thin-walled steel; Design capacity formula; Failure mode; Pull-out capacity; Screw connection; Static test;

D O I：

10.14006/j.jzjgxb.2020.0032

中图分类号：

学科分类号：

摘要：

In order to investigate the effects of the steel strength, the sheet thickness, the outer diameter and inner diameter of screws, the thread pitch and the diameter of drill points on the failure mode and pull-out capacity of screw connections for cold-formed thin-walled steels, the pull-out tests were carried out on 287 specimens using LQ550 steel with the thicknesses of 0.8 mm, 1.0 mm and 1.2 mm, and S350 cold-formed steels with the thicknesses of 0.8 mm, 1.5 mm and 2.0 mm in combination with various screw combinations. The experimental results show that the major failure mode of sheets with a thickness larger than 1.0 mm is thread shear failure, and the thread shear failure mode is more pronounced when the thickness is higher. For ultra-thin sheets with a thickness of 0.8 mm, the screw hole extrusion is the major failure mode, which becomes more significant when the outer diameter of screws is large and the steel strength is low. The influence of thread pitch on the pull-out capacity is small. The pull-out capacity increases with the increase of the outer diameter of screws and decreases with the increase of the inner diameter of screws, and this trend is more notable for ultra-thin sheets. For self-drilling screws, the pull-out capacity should be calculated with the larger value between the inner diameter and the diameter of the drill point, and the pull-out capacity increases with the decrease of the diameter of the drill point. It is indicated that the formula for the pull-out capacity of LQ550 high-strength steel sheets in the Chinese code gives unsafe results, especially for ultra-thin sheets with the thickness of 0.8 mm. Finally, a new formula for the pull-out capacity considering the steel strength, the sheet thickness, the outer diameter and inner diameter of screws, the thread pitch and the diameter of drill points was proposed with higher applicability and reliability. © 2021, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：144 / 153

页数：9

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